Question

实际上，我使用的是RestKit 0.22。

在我的代码中，我添加了对象映射：

RKEntityMapping *materialMapping = [RKEntityMapping mappingForEntityForName:NSStringFromClass([Material class])
                                                       inManagedObjectStore:[RKObjectManager sharedManager].managedObjectStore];
...
RKResponseDescriptor *responseMaterialsDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:materialMapping
                                                                                                 method:RKRequestMethodGET
                                                                                            pathPattern:urlMaterials
                                                                                                keyPath:kRestApiMAterialsKeyPath
                                                                                            statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

[[RKObjectManager sharedManager] addResponseDescriptor:responseMaterialsDescriptor];

通常这段代码工作正常，请求正确的url后我得到正确的响应并将对象存储到本地数据库。

现在我想要请求相同的url但是在将JSON响应映射到Material对象之后不将结果存储到数据库。我想在经过一些修改后插入所有项目。您有什么建议我如何通过RestKit避免将对象存储/保存到数据库？

Answer 1

如果您希望在映射后添加一些属性或修改现有属性，那么您应该使用mappingMetadata并从中创建responseDescriptors。

[materialMapping addAttributeMappingsFromDictionary:@{@"@metadata.property1": @"property1", @"@metadata.property2": @"property2"}];
RKResponseDescriptor *materialResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:materialResponseDescriptor pathPattern:@"somPath" keyPath:@"" statusCodes:RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful)];

然后将响应描述符添加到 RKObjectManager 并创建 RKManagedObjectRequestOperation 以从远程URL获取

  RKRoute *route = [[[[RKObjectManager sharedManager] router] routeSet] routeForName:routeName];
  [self cancelAllRequestWithMethod:route.method matchingPath:route.pathPattern];
  NSMutableURLRequest *request = [_objectManager requestWithPathForRouteNamed:routeName object:nil parameters:nil];
  RKManagedObjectRequestOperation *operation = [[RKManagedObjectRequestOperation alloc] initWithRequest:request responseDescriptors:[[RKObjectManager sharedManager] responseDescriptors]];
  operation.managedObjectContext = [RKManagedObjectStore defaultStore].persistentStoreManagedObjectContext;
  operation.managedObjectCache = [RKManagedObjectStore defaultStore].managedObjectCache;
  operation.savesToPersistentStore = YES;

现在，设置映射元数据即。这是映射完成时将映射到原始属性的值，

[operation setMappingMetadata:@{@"property1": value1, @"property2": value2}];

然后，排队操作，它应该将自定义值映射到属性。注意，property1和property是实体中的属性，您不为它创建responseDescriptor。

[[RKObjectManager sharedManager] enqueueOperation:operation];

RestKit对象映射没有存储在数据库中

1 个答案: